BUG/MINOR: backend: Remove CO_FL_SESS_IDLE if a client remains on the last server

When a connection is picked from the session server list because the proxy or
the session are marked to use the last requested server, if it is idle, we must
marked it as used removing the CO_FL_SESS_IDLE flag and decrementing the session
idle_conns counter.

This patch must be backported as far as 1.9.
1 file changed